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• W2073580200 abstract "The purpose of this study was to determine the mechanisms by which the pesticide, methoxychlor (MXC), acts as an environmental endocrine disruptor through interaction with the three largemouth bass (Micropterus salmoides) estrogen receptors (ERs) α, βa, and βb. MXC is a less-environmentally persistent analog of DDT that behaves as a weak estrogen. Using transient transfection assays in HepG2 cells, we have previously shown that each receptor is responsive to the endogenous ligand 17β-estradiol (E2) in a dose-dependent manner. The parent compound, MXC, showed dose-dependent stimulation of transcriptional activation through all three ERs. In addition to the parent molecule, each of the metabolites was also estrogenic with all three ERs. The order of potency for ERα and ERβb was HPTE > OH-MXC > MXC, while the opposite order was seen for ERβa. HepG2 cells did not substantially metabolize MXC to the active metabolites, thus the activity of MXC was not due to metabolism. When examining the effects of increasing concentrations of MXC at a fixed concentration of E2, all three ERs show increased activity compared to that with E2 alone, showing that the effects of MXC and E2 are additive. However, when this experiment was repeated with increasing concentrations of HPTE at a fixed concentration of E2, the activity of ERα was decreased, that of ERβb was increased, while that of ERβa was unaffected compared to E2 alone. These experiments suggest that HPTE functions as an E2 antagonist with ERα, an E2 agonist with ERβb and does not perturb E2 stimulation of ERβa. While it is clear the ERβ subtypes are the products of different genes (due to a gene duplication in teleosts) the differences in their responses to MXC and its metabolites indicate that their functions diverge, both in their in vivo molecular response to E2, as well as in their interaction with endocrine disrupting compounds found in the wild." @default.
• W2073580200 created "2016-06-24" @default.
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• W2073580200 date "2008-01-01" @default.
• W2073580200 modified "2023-10-15" @default.
• W2073580200 title "Stimulation of transactivation of the largemouth bass estrogen receptors alpha, beta-a, and beta-b by methoxychlor and its mono- and bis-demethylated metabolites in HepG2 cells" @default.
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• W2073580200 doi "https://doi.org/10.1016/j.jsbmb.2007.06.004" @default.
• W2073580200 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2268757" @default.
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